function Xdata_all = load_all_train_data()
    Xdata_all = cell(8,1);
    [Xdata_all{1}, ~] = read_pc('../../../data/halS1_train.X', '../../../data/train.Y48');
    [Xdata_all{2}, ~] = read_pc('../../../data/halS2_train.X', '../../../data/train.Y48');
    [Xdata_all{3}, ~] = read_pc('../../../data/halS3_train.X', '../../../data/train.Y48');
    [Xdata_all{4}, ~] = read_pc('../../../data/halS4_train.X', '../../../data/train.Y48');
    [Xdata_all{5}, ~] = read_pc('../../../data/halS5_train.X', '../../../data/train.Y48');
    [Xdata_all{6}, ~] = read_pc('../../../data/halS6_train.X', '../../../data/train.Y48');
    [Xdata_all{7}, ~] = read_pc('../../../data/halS7_train.X', '../../../data/train.Y48');
    [Xdata_all{8}, ~] = read_pc('../../../data/halS8_train.X', '../../../data/train.Y48');
end

